Pterobranchia - Graptoloidea - Retiolitidae
Parent taxon: Retiolitidae according to M. J. Melchin et al. 2011
See also Bulman 1970 and Lenz and Melchin 1987
Sister taxa: Mirorgraptus, Petalolithinae, Plectograptinae
Subtaxa: Pileograptus Pseudoplegmatograptus Pseudoretiolites Retiolites Sinostomatograptus Stomatograptus
Ecology: passively mobile planktonic suspension feeder
Distribution:
• Silurian of Algeria (1 collection), Andorra (1), Australia (1), Canada (8: Northwest Territories, Nunavut, Yukon), China (11), Denmark (5), France (1), Greenland (1), Guinea (1), Morocco (4), Saudi Arabia (1), Serbia and Montenegro (7), Sweden (2), United States (18: Alaska, California, New York), Western Sahara (1)
Total: 63 collections including 84 occurrences